Geared die-stock.



H. W. OSTER.

GEARED DIE STOCK.

APPLICATION FILED SEPT. I6, 1915.

1 1 85 ,929 Patented June 6, 1916.

UMTED STATES PATENT OFFICE.

HERMAN w. OSTER, 0E CLEVELAND, 01-110,. ASSIGNOR TO THE OSTER MANUFACTURING coMP NY, OF CLEVELAND, OHIO, A CORPORATION DE 01110.

GEARED nIE-srocK, 2

Patented June 6, 1916.

Application filed September 16, 1915. Serial N 0. 50,920.

7 To all whom it may concern Be it known that I, HERMAN W. Os'rER, a

citizen of the United States, residing at;

Cleveland, in the county of Cuyahoga and State of Ohio, have invented a certaln new and useful Improvement in Geared Die- Stocks, of' which the following is a full, clear, and exact description.

This invention is in the nature of an 11nprovement upon geared die stocks whlch are typified by the machine which is shown and described in my prior Patent No. 1,075,059; 1

the object being to automatically return the dies to the thread-cutting position after they have been withdrawn, and after the threaded piece of work has been pulled backward out of the die stock.

The invention consists in the construction and combination of parts shown in drawings and hereinafter described and pointed out definitely in the appended clalms.

In the drawings, Figure 1 1s a perspective view of a geared die stock which embodies The machine shown in the drawings and to which this improvement is applicable is or may be like that shown and described in said prior patent, in having a slidmg carriage 10 on which the work may be clamped; and means for automatically returnmg the carriage to its starting position when the dies have been withdrawn after the work has been threaded. Also in having a rotatable die head 12 carrying a plurality of radially movable dies 13, and a cam plate 14: for moving the dies to and w-lthdrawmg them from their working positions, which cam plate is mounted on the die head, and is capable of turning thereon. Also 1n having a locking lever 15 mounted on the c am plate for holding said plate in the position it must be in when the dies are cutting a thread, and to which power may be applied to first unlock the cam-plate and then turn it in that direction which will cause the withdrawal of the dies from the work; and also in having a throw out bar 16 with which said locking lever will engage when a thread of the desired length has been cut on the work.

In a machine having the above mentioned characteristics of construction, the cam plate locking mechanism will engage the throw out bar (which is fixed to the carriage) when the desired thread has been out upon the work which is clamped to the carriage, with the result that the cam plate will be unlocked, and then turned backward to thereby withdraw the dies from engagement with the work; and that, immediately following this, the carriage will be automatically retracted.

The new parts, as shown, by which such a geared die stock is endowed with the capac ity for automatically resetting the dies, have been so designed that they may be attached to this particular geared die stock, and in such positions that they'will cooperate with the ordinary parts thereof to produce the de- I sired result. In fact, to equip the geared die stock of said prior patent with the present invention one has merely to secure to the die head the bracket. 20 which carries certain parts to be described; to provide the cam plate with the lug r30; and to then fixto the frame work of the machine the bar 34 which carries the latch release 33. It will, however,

be clear to any one skilled in this art that it is not necessary that these parts beformed as attachments to a known machine, or that they be constructed in precisely the form in which they are shown in the drawing.

The bracket 20 has a curved foot 21 which fits the cylindrical exterior of the rotating die head and this bracket is adjustably fixed to the die head by means of a bolt 22 Which goes through a circumferentially extended slot 21 in said bracket foot. In a socket 23 in this bracket there is a spring-actuated cam-plate resetting device in the form of a plunger, whose end projects through the end of this socket, and engages a lug 30 fixed to the cam-plate, This plunger is under the influence of a spring 26 tending to push it out as far as it. can go, that is to say, until shoulder27 on said plunger engages the end of the socket, and to thereby movethe camplatein the die resetting direction.

A latch lever 28 is pivoted to this bracket, and has at one end a toe 29 adapted to enter the socket 23 and to engage the surface of the plunger or the shoulder 27 as the case lever has moved into this latching position the outer face of that end with which the spring plunger 32 engages will be brought into the plane of the latch release 33, which, in the form shown, is merely a short hori zontal pin carried by a vertical bar 34, which is fixed to the frame work of the machine.

The described machine, equipped with this invention, acts as follows: When the desired length of thread has been cut upon" the work, the cam-plate locking lever will engage the throw out bar 16, and first, unlock the cam-plate, and then turn it so as to cause the dies to be withdrawn from the work. As the cam-plate is so turned the lug 30 thereon, by reason of its engagement with the plunger 25, will push the plunger back until the latch lever 28 can and does engage it and hold it back. As soon as the dies are withdrawn the carriage will be automatically returned to its starting point by the mechanism provided for that purpose and fully described in said prior patent. The

die head, however, has continued to rotate,

and by the time it has completed approximately one-half a revolution, during which time the carriage has been retracted as stated, the end of the latch lever 28 will engage the latch releasing pin 33 and thereby Copies of this patent may be obtained for five cents each,

the latch lever will be so rocked as to release the plunger. This plunger under the influence of its spring will push the cam plate around to that position it must occupy when the dies are in working position; and the cam-plate locking lever will lock it in this position automatically and hold it there while a new thread is being cut, and has been completed; whereupon these operations will be repeated. v

Having described my invention, I claim:

1. The combination with a geared die stock having .a rotatable die head, dies carried thereby, a cam-plate for positioning said dies,which cam-plate is rotatably mounted on said die head and has an out wardly projecting lug, a Work holding carriage, and a throw out bar fixed to said carriage, of a spring-actuated cam-plate resetting device which engages said lug, and a spring-actuated latch for holding said resetting device against its spring induced movement, and afixed latch release.

2. The combination of a geared die stock having a rotatable die head, dies carried thereby, a cam-plate for positioning said dies,which cam-plate is rotatably mounted on said die head and is provided with an outwardly projecting lug, a work holding carriage, and a throw out bar fixed to said carriage, of a bracket adjustably fixed to said die head, a spring-actuated plunger mounted on said bracket in engagement with the lug on the cam-plate, an automatic latch mounted on said bracket for engaging and restraining said plunger, and a fixed latch release.

In testimony whereof I hereunto affix my signature.

HERMAN W. OSTER.

by addressing the Commissioner 61 ratents.

Washington, 10.0. 

